Sealing device for coke oven door

ABSTRACT

The perimeter of the door frame of a coke oven door is fitted with a sealing knife edge and a plurality of pivotal interacting levers mounted to the door frame. The levers exert uniform forces on the knife edge and the door jam.

WMW i755 L. G. TUCKER SEALING DEVICE FOR COKE OVEN DOOR Filed Feb. 1, 1972 r 2 Slwets-Sheet 3 "1 E w kg United States Patent 3,785,932 SEALING DEVICE FOR COKE OVEN DOOR Linwood G. Tucker, Pittsburgh, Pa., assignor to Koppers Company, Inc. Filed Feb. 1, 1972, Ser. No. 222,583 Int. Cl. (31% 25/06 U.S. Cl. 202-248 3 Claims ABSTRACT OF THE DISCLOSURE The perimeter of the door frame of a coke oven door is fitted with a sealing knife edge and a plurality of pivotal interacting levers mounted to the doorframe. The levers exert uniform forces on the knife edge and the door jam when the door is in the closed position.

BRIEF SUMMARY OF THE INVENTION A plurality of spaced apart first levers are pivotally mounted to the external surface of a coke oven door frame and a plurality of spaced apart second levers are also pivotally mounted externally to the door frame. The ends of the first levers coact with the ends of the second levers that also coact with a sealing knife edge mounted externally to the door frame. Conventional J-bolts hold the knife edge in place. Stops are provided at the corners of the door frame to keep the knife edge in proper position.

For a further understanding of the invention and for features and advantages thereof, reference may be made to the following description and the drawing which illustrates a preferred embodiment of equipment in accordance with the invention.

BRIEF DESCRIPTION OF THE DRAWINGS In the drawings:

FIG. 1 is a simplified schematic view of one side of a coke oven door equipped with an embodiment of the invention;

FIG. 2 is an enlarged view of a portion of the structure of FIG. 1;

FIG. 3 is a sectional view along line IIIIII of FIG. 2;

FIG. 4 is a sectional view along line IV-IV of FIG. 2; and

FIG. 5 is a simplified schematic prespective view of one corner portion of the door of FIG. 1.

DETAILED DESCRIPTION Referring to FIG. 1, a door frame 11 of a conventional coke oven door is provided with a plurality of pivotal, interacting levers 13, 15 that are mounted to the door frame 11 by means of bolt and nut assemblies 17, 19 which are indicated also in FIGS. 3 and 4.

The door frame is also fitted around its entire perimeter with a sealing knife edge 21 that is secured in place by means of a plurality of J-bolts 23 in a conventional manner. The sealing knife edge 21 is disposed to engage a sealing surface 25 of a conventional door jamb 27, when the coke oven door is in the closed position.

The levers 13 are generally triangular in shape with one apex 29 at the top having an arcuate shape, as shown in FIG. 2. The levers 13 are long enough to overlap the spaced apart ends of the levers 15 mounted below and between levers 1-3, as shown in FIGS. 1 and 2.

The end portions of the levers 15 have rounded bosses 31 thereon that coact with the bottom surface of the superimposed levers 13. The bottom apex 33 of each lever 15 is also rounded as shown and it engages and coacts with the top edge surface of the sealing knife edge 21.

Each one of the levers 13, 1-5 is provided with an oval hole 35 through which the pivot bolts 17, 19 extend,

and these oval holes 35 permit the lever 13, 15 to move up and down freely within limits, as defined by the size of the oval holes 35.

The upper edge portion of the door frame 11 carries an elongate rectangular bar 37 on the outside, which bar cooperates with short angle-shaped bearing members 39. Both the elongate rectangular bar 37 and the short angleshaped bearing members 39 are secured to the door frame 11 by means of conventional bolt, nut and washer assemblies 41.

The structure shown in FIG. 5 illustrates a pair of stop bars 43, 45 that are bolted as at 47, to the door frame 11 at each corner of the coke oven door frame. The stop bars 43, 45 are disposed in a position just slightly above, or just contacting the top edge surface of the sealing knife edge 21. These stop bars 43, 45 are installed where shown to ensure that the sealing knife edge remains in the desired attitude with respect to the door frame 11, and to prevent the sealing knife edge from becoming canted out of its position or location.

It will be noter further that the sealing knife edge 21 is made in lengths to suit the respective side lengths of the door frame 11, and that at each corner, one side length of sealing bar overlaps the adjacent abutting end of a side length of bar 21a. Preferably, the overlapping sealing knife edge bars 21, 21a are welded to make an airtight seal at the corners of the door frame.

When a coke oven door is properly hung and latched closed, the latches exert a force on the door frame which then also exerts a force on the sealing knife edge that urges it into contact with the door jamb.

Heretofore, spring loaded plunger and other devices have been used to try to urge the sealing knife edge into contact with the door jamb and to make a satisfactory seal therewith. Some of the sealing devices used include thin stainless steel plates, springs, plungers, and adjusting screws which are costly to maintain and which, in many instances, do not exert enough force on the door jamb to make an effective seal.

The pivotal interengaging lever system of the present invention, however, exerts equal pressure at spaced apart locations on the sealing knife edge; such locations being where each rounded apex 33 contacts the upper edge surface of the sealing knife edge. The system of levers is so arranged that the force exerted by each lever is equal to the force exerted by every other lever.

From the foregoing description of one embodiment of the invention, those skilled in the art should recognize many important features and advantages of it, among which the following are particularly significant.

What is claimed is:

1. In a coke oven door having a door frame that has a knife edge sealing strip peripherally surrounding the door frame for engaging a door jamb, and that has means for holding the sealing strip against the door frame, the improvement comprising:

(a) a plurality of spaced-apart first levers pivotally mounted to the external surface of said door frame; and

(b) a plurality of spaced-apart second levers pivotally mounted to the external surface of said door frame with the end portion of each said second lever disposed to engage an end portion of the adjacent first lever; with (c) each one of said second levers being movable in a plane vertically disposed toward said door jamb and into engagement with said knife edge sealing strip whereby, when said coke oven door is latched closed, said first levers coact with said second levers which coact with said sealing strip, thereby urging it into intimate sealing relation with said door jamb, and

(d) a pair of stops mounted externally to said door frame adjacent each corner thereof in such a way that said stops coact with and keep said sealing strip in a preselected attitude.

2. The improvement of claim 1 wherein:

(a) each one of said first levers is triangular in shape with one apex thereof coacting with said door frame; and wherein (b) each one of said second levers is triangular in shape with one apex thereof coacting with said sealing strip.

3. In a coke oven door having a door frame that has a knife edge sealing strip peripherally surrounding the door frame for engaging a door jamb, and that has means for holding the sealing strip against the door frame, the improvement comprising:

15 (a) a plurality of spaced apart first triangular shaped levers pivotally mounted externally to said door frame with one apex of each said lever coacting with said door frame;

(b) a plurality of spaced apart second triangular levers pivotally mounted externally to said door frame with one apex disposed'to engage said sealing strip and with the other two apices disposed to engage end portions of adjacent first levers; and

(c) stop means mounted externally to said door frame adjacent each corner thereof in such a way that said stop means coacts with said sealing strip and keeps the same in a preselected attitude.

References Cited UNITED STATES PATENTS 2,007,318 7/1935 Wilhelm 202-248 FOREIGN PATENTS 810,152 8/1951 Germany.

NORMAN YUDKOFF, Primary Examiner D. EDWARDS, Assistant Examiner 

